Widespread in plants of prefabricated reinforced concrete.
For reinforced concrete pipes of large diameter, Soviet experts have developed and introduced a method of vertical vibration forming with vibrators, hung on the outer part of the form.
In the manufacture of cylindrical and other designs (pipes, masts, supports, tubular columns, etc. p.) using various designs of centrifuges, a centrifugged method of compaction of concrete mixtures is widely used widely used.
The combined methods of compaction of the concrete mixture, for example, vibrohydropression in the manufacture of reinforced concrete pressure pipes, are widely used.The combined methods of compaction of the concrete mixture are used in a number of factories and in the manufacture of other parts and structures.A special place in the technology for the production of prefabricated reinforced concrete is occupied by the processes of acceleration of concrete hardening in structures.
In domestic factories, the heat method of acceleration of concrete hardening was most widely used. The use of the thermal method allows you to obtain products with 70%concrete strength after 8-10 hours of hardening.
The method of electro -processing reinforced concrete products has become distributed. It is used when heating products from heavy and light concrete manufactured in individual metal forms and cassette installations. Electrographs of products allows you to reduce the heating time of the concrete mixture, increase the temperature and reduce the overall heat treatment cycle.
One way to accelerate thermal treatment is the electric heating of the concrete mixture before molding, known as the technology of hot shape of the concrete mixture. Preliminary heating of the concrete mixture, as a method of acceleration, was known in the practice of construction before. But in recent years, Soviet experts have improved this method in relation to factory conditions, and the Serpukhov plant of prefabricated reinforced concrete for the first time successfully mastered it.